Respostas morfofisiológicas de Allagoptera arenaria (Arecaceae) às mudanças climáticas globais em um ambiente de restinga.

Abstract

Due to changes in weather patterns around the world, a scenario of climate change is expected, such as rising temperatures and changing rainfall patterns. Plants have mechanisms that allow survival and development in complex environments where they live, thus responding to environmental changes, altering their morphology, anatomy and physiology. The objective was to identify the possible effects of temperature increase and pluviometric volume on the structure of the leaves of Allagoptera arenaria (Gomes) Kuntze in a restinga environment. In this study, to simulate the temperature increase, modified open top chambers (OTC's) were used, and rain gauge was used to increase the rainfall volume. In a natural restinga environment, 40 A. arenaria shrubs were selected in four treatments, open-control environment (C), 25% (P) rainfall increase, 2 ° C (T) temperature at 2 ° C and rainfall volume at 25% (TP). Morphological, anatomical and physiological analyzes were performed in these individuals. The results showed that the individuals submitted to the treatments TP and P presented the highest averages for almost all parameters analyzed, such as: leaf area, photosynthetic pigments, stomatal density, cuticle thickness, etc. With the results obtained, it was possible to conclude that the effects of the temperature increase and the isolated and combined rainfall volume caused different responses in the individuals of A. arenaria, corroborating with the hypothesis of the study. However, although the individuals showed alterations in the different treatments, these modifications were not extreme to the point of harming the species. Thus, the species studied can be indicated for reforestation and recovery programs in degraded areas of restinga due to their plasticity at different environmental conditions.